Apparatus for shaping saw teeth



July 5, 1932- c. A. .HAcH E1' AL 1,856,101

APPARATUS FOR SHAPNG SAW TEETH Filed April 18. 1928 #We/rmi@ dare/:ce A.Had/I hdr/es H047 Patented July "5, 1932 x n UNITED" sTAJllIsy PATIENT 5CLARE-non Antenna nnen, or OAK'PARK, l'Ann CHARLES @mW-:NG @y ,CHICGO ,yImmers, Assienons To WESTERN ntncrmceonrnn, moonnoaA'rnnon-nnw.YoR-K,'N.Y.,acoi vrone-r1on orinnivYORK 1^ i APPARATUS.ron-snaemesnw-This invention relates generally to an ap-V paratus for shaping sawteeth, and more par-kk ticularly to an apparatus for dressing 'andjointing circular rippsaws. Y Y

Considerable experimentation has been conducted in the vpast for the`,purpose of finding some apparatus that would dress and joint a saw insuch a Way that thesaw an apparatus for dressing andjonting a saw Whilethe saur is being actuated at its normal operating speed, so that thesaW will produce a smooth surface or edge on the Wood. 1 y.

ln accordance With the general features of the invention there isprovided an apparatus for dressing and joint-ing the saw While the sawis in operating position in the :sawing machine and While the sav;Trunningratits normal operating speed. The :reason lfor .a dressing andjointing the saw whileitmoves at its operating speed is that the saw maythen assume a slightly diferent shape from What it takes When moving at;only partial operating speed or when stationary! `The :an apparatusconsists generally of a pair of abrasive members for Vdressing the sides`.of the teeth and of an abrasive memberfor jointing the tops oftheteeth. n The three abrasive members, Which may beiles or may consistof carborundum. or a like :abrasive substance, are adjustably mountedina uni-- tary support which is slidably attached tothe end `of .anadjustable arm which may be mounted on theframe of any ordinarysawing wmachine. YAgauge is vremovably attached to the unitary support foraligning the abrasive members With the sawand for determining theirrelative adjustment. l, l v

vA clear understanding Vof the invention v59 maybe had from theVfollowing detailed-descriptas rene emboaimear aereos sul whereinv fFig. lis asideview ofA an apparatus lem-"- bodying "the invention,showing the appara` tusiattaehed ltoja sawing machine frame;

' Fig. 2 isa front'vievv oftheapparatus-and shows a savvinlalignmentwith'the 'attached gauge.; y l

feature theabrasive niembers during `the various stagesOfoperatIon, and

i fragmentaryfront View showing relatlveposltions ofthe "saw withrespect to lustr'ated in "the accompanying dra-Wing,

'Fig'. vx5 isa cross-'sectional plan view of the nxt-ure supporting Itaken 'on line -'fo'f FigQi j y v 'Referring no'w to "thedrawn'g indetail in closed acircularsaw 10 mounted nina saw-ing machine, 'aportionlof'theframeof which is shownJjasf'ljl.v 'Itislnovvn that onaccount of stressessetlup `due to rapid motion a movthe labrasivemembers kWhichflike numerals designate like parts p throughout theseveral views,"there` is dising sawmayassuinea slightly diferent shapefrom` a sawi that isnot 'inovecla't any apprerci#` able spe`ed,"fandthusfor satisfactor results 1n dressing 'it "is rconsidered best to" speed.`That thespeed rat'vvhich' some saws operate isconsiderable'is,evidenced'byfthe f V -jfact thatlsome'circular saws Aare frequently operated atSGQOfR". M., Whielrin'th'e ease of Y a' saw 14yinches inf diametery amounts lto ka h ress 'the n Vsaw While the sawlsrunning at its' operatingy j l peripheral speed of over v'twomiles...per minf- Y ute. v V'lhegsawing machine and kits framemay be'of anyusual'and-suitable typeadaptedffor suitably 'supporting and operatingthe fro! tating saw of a sawing machine for produce 'j n ingedgessuitable for.y gluing, and no details ofthem are-:givenliere since thesawin'gfma chineforms nopartof the invention. Abase 12, rigidly securedto thefra-me portionlll by means of screws T13 and 14;, supports a leverarm jl'hinged Vthereto through yan .adjusting screw .'20vrotatablymounted Within Zlugs 21 and 2Q integral Withthe. base a andprojecting through apertures in lugs 23 and 24 integral with the leverarm. The adjusting screw 2() the adjusting screw 20.. A tip`31 projectsfrom the lever arm to'provide a rest for the arm onv the frame 11 togaidin the movement of the arm along the screw 20.

'The arm 15 carries a unitary support or A.abrasive holding member"32Hw`h'1chf1s slidably mounted on the end et the arm by means of atrapezoidal channel 33'provided withinv 'themember 32 for receivingflanges 34 and 35 integral with the end of the arm 15. A retaining piece40 (Fig. 3) and cooperating screws 4:1, engaging depressions 19 in'theretaining piece, serve to rigidly secure the abrasive holding member32 to theiiangesle and and yet to permitY the member 32 to slidevertically thereon. For movingthe holding member 32 along the flangesB/land 35, an vadjustmentf screw 42 is rotatably mounted within anaperture` in aprojection 43 of. the holding member 32, and the threadedlower `end ofthe adjustment screw engagesV threads within an aperture inan enlarged portion47 of the arm 15 within which aperture the adjustmentscrew may be rotated toV causeit to move vertically. v Collars la and 45attached to the adjustment screw t2 and abuttingagainst the projection43 prevent the screw 42 from moving lengthwise within the aperture inthe projection 43. A knurled head 46,'integral with the collar 45,serves as a means for actuating Ythe adjustment screw 42. Y l

lThree abrasive members 50,51 and 5 2 are securedl within'the abrasiveholding member or unitary support 32. The top ,j abrasive member 50 Visadjustably retained Vwithin a groove in the support 32 by a clamp 53which bears against the abrasive member, and theV lateral abrasivemembers 51 and 52are adjustably retained in grooves in supports and 56projecting downwardly from the vsupport 32 by clamps` 58 and 59 Vwhichbear against the abrasive members. By adjustably mounting the three Yabrasive kmembers 50, 51 and 52 within the ,one holding member orunitary support 32 inthe manner just stated, the position or threeyabrasivemembers may be regu'- lated with respect to each other 'and inad- Vthe saw. I As aV means dition the three abrasives may be movedras aunit for thepurpose of aligning them with .for accomplishing vrthealignmentof the abrasive members with the saw, a removable `gauge 60 isattached tothe bottom of the supports 55 and 56 by means of pins 67 and68 projecting from the supports v and engaging apertures in the gauge,and byV screws 69 and 7 O which secure the gauge 601 05 .tothe supports55 and 56. Fig. 2 shows how andthe true alignment of the abrasiveholding member 32 is determined by ittingthe groove 71 over thestationary saw 10. The -correct relative adjustment of the lateralabrasive members 51 andV 52 isdeterminecl -by a projection 62 vfrom theupper portion of the gauge 60, which projection is in direct alignmentwithv the groove 71 fitting over thevsaw and is of the rsame width. Bycontaeting thetips :of the abrasive members 51 and 52 against theprojection62 Athe abrasive members are placedrin correct working posi.tion. v

The operation of the apparatus will now be described. For the purpose ofsafety the saw 10 is lfirst made stationary, while the abrasive holdingunit 32 is swung upon the arm 15 to bring the attached gauge 60 over thesaw. The support 32 and the attached gaugel 60 are adjusted laterally byturning the lrnurled head 3() until the groove 71 of the gauge will'itover thetooth of Ythe saw as shown in F ig. 2. In order to bring theslot 71 into engagement with the saw 10 it may be necessary to lower thesupport 32 on the arm 15 by'V adjusting the knurled head 16. Thisengagement of the groove 71 with a saw tooth determines the correctlateral alignment or' the unitary support 32 with the saw, and the gauge60 at this stage also serves to determine the correct position of theabrasive members 51 and 52, astthe operator must see that the abrasivemembers are in contact with the projection 62 ofthe gauge,'which is ofthe Vsame width and Yis placedin the same plane as the knurled head i6is Aactuated to lower the abrasive holding unit 32 until the top of atooth projects up between the'abrasivc members in the position indicatedat 70 (Fig. 11). `Now the saw is 'rotated at its normal operating speedand thelrnurled head ltiis then ac tuatedto raise the holding unit 32kto raise Y'abrasive members51 and 52simultaneously into engagement withthe edgesof the teeth, as indicated lbyl position designated 71 (Figa).VIt is to be Vnoted in Fig. 4: that the diierent positions of the sawrelative to the abrasive members'have been indicated'rather than thediiferent positionsof the abrasive members. The saw,of course alwaysoccupies the same position, and it is the'position of the support 32that isv regulated. In order to operation, and the saw is now stopped,the abrasive members disengaged from the teeth and the apparatus swungupon the arm 15 to 1 make room for thev operation of the sawing 5machine.

It is to be noted from the foregoing description that the disclosedapparatus lhas been designed for shaping `the'teeth of a saw while thesaw is actuated at its normaloperating speed, since a saw Vso actuatedassumes substantially the same shape that it takes while in actualoperation. Such design ofcourse` necessitates rigid constructionthroughout as the speeds at which some saws operate'is so great as tovibrate the abrasive members were a rigid construction not provided. Theinvention therefore provides rigidly held abrasive members forcooperating with rapidly moving saws in `order t0 eliipose.

ciently and economically carry out its purscribed in connection witha'circular saw havapply equally as well to straight or to set teeth andwould adapt itself to any sawmachine to which it could be attached.

It is of course to `be understood that the Y invention is not limited tothe embodiment f herein disclosed but is susceptible of variousmodifications without departing from the scope ofthe appendedclaims..

What is claimed is:

l. In an-apparatus for shaping the teeth of a saw, wherein abrasivemembers are mounted in oppositely disposed supports for` engaging theteeth; a gauge shaped to project between the abrasive members and having a portion adapted to engage the saw, and

lmeans for securing the gauge to the supports.

2. In an apparatus for shaping the teeth of a saw, wherein abrasivemembers are mounted in oppositely disposed supports for engaging theteeth; a gauge shaped to engage the saw and having a portion ofpredetermined thickness adapted to be inserted between abras sivemembers tocontrol the spacing thereof'.O ln witness whereof, welhereunto subscribe our names this 7 th day of April, A. D. 1928.CLARENCE ALBERT HACH. CHAR-LES RVINGHOAG.'

The invention has been shown and deing swaged teeth, but the inventionwould

